I have a stateless and immutable system based on arch images that get built every night. I also have two different images for the same machine: one for general use and one optimised for music production. I just rebooted into the other image and I'm set.
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I have a ZFS Ubuntu deaktop install que on an all amd PC and use snap. Given that everyone else has something completely extravagant and hate snaps, I'd say my standard build is unusual.
Just a reboot. There's an EFI menu listing all the available images - I keep a couple of old ones around to roll back to in case of problems - and I just select the one I want.